Unix


 * everything is a file
 * IPC through pipes | streaming I/O
 * for privilege escalation, have the setUID bit
 * FS more advanced than TENEX
 * in Unix, mount device to arbitrary point
 * in TENEX, first part of file path is device ID
 * FS distinguished between "small" and "large" files
 * FS did not support soft links or user groups
 * FS
 * a directory entry contains only the name of a file and an inode number (i-number)
 * the inodes are stored in a a system table in a known part of the device, and the i-number indexes into an inode (so it appears the inodes are stored in their own special part of disk)